No shadows on plane in Eevee Rendering
To make the shadows stand out the most, a point light with a small radius is ideal. However, if you are using an area light or a sun light (or other large scene lighting), you can still achieve clean shadows by disabling &quot;Soft Shadows&quot; in the Render Properties settings. This will give the shadow an &quot;aliased&quot; look, however, so you may have to increase the Cube Size accordingly. Also, make sure to check &quot;High Bitdepth&quot;.

For any lights you are using, go to the light properties, and make sure &quot;Contact Shadows&quot; is checked. This will make sure adjacent touching surfaces don't allow light to leak through.